I'm no expert and we're all applying hoping to get those interviews. The fact that you're already a pediatric dentist may be a plus or a minus for some schools. The biggest limiting factor for you will be the fact that you're a foreign applicant. Having said that though, if you apply to the right schools, you still have a chance. Which schools are the right schools is a tougher question, you'd have to get in touch w/ someone who's gone through the process. You can only apply and see what happens.
Good luck. Having said that if I don't hear something soon, I'm throwing my computer out the window.